Motor-boat.



v A. L' BARTLETT.

MOTOR BOAT- APPLICATION FILED MAR. 24, 19:5.

1,167,876, v Patented mu, 1916.

w/m ss M O W $6M, Andrew-J. Bartlett,-

UNITED STATES PATENT OFFICE.

ANDREW J. BARTLETT, OF REVERE, MASSACHUSETTS.

MOTOR-BOAT.

Application filed March 24, 1915.

T all whom it may concern:

Be it known that I, ANDREW J. BARTLETT, a citizen of the United States, residing at Revere, in the county of Middlesex, in the State of Massachusetts, have invented a certain new and useful Improvement in Motor- Boats, of which the following is a specification, reference being had to the accompanying drawings.

The immediate object of this invention is to provide simple but effective means for the prevention of the fouling of the screw and its shaft in motor boats, and also for accelerating the speed of such boats.

My invention is clearly illustrated in the annexed drawings, Figure 1 being a side view of a boat embodying my present improvement and Fig. 2 being an underside plan of said boat.

Briefly described my improvement consists in providing below the screw and rudder a plate a of considerable width that is fastened to the skag, or keel, and extends rearward and to a point beyond the rudder and is pitched downward as seen in Fig. 1 of the drawings. The said plate is, by preference, about equal in width to the midships cross section of the hull (see Fig. 2), thus presenting to the water an inclined plane of considerable area which operates, when the boat is in motion, with a tendency Specification of Letters Patent.

Patented Jan. 11, 1916.

Serial No. 16,584.

to ride upward by reason of its impact with the water, and to lift the hull in an appreciable degree, thus reducing somewhat the displacement of water and increasing correspondingly the speed of the boat. The said plate forms, in effect, a rearward extension of the keel and, being smooth, permits sea-weed, and the like floating material, to drift past the screw and rudder without fouling them.

My described device adds very little to the cost of construction of such boats yet it effectually prevents fouling of the rudder and screw, and increases materially the speed of such boats.

Having thus described my invention, I claim as new and wish to secure by Letters Patent:

In combination with a motor boat, an inclined plane of the approximate width, of the mid-ships, in cross-section of the boat, with its inner end fixed to the keel or skag at its aft end, said inclined plane being positioned under and extending beyond the rudder, with the lower end of the rudder-shaft or post bearing in said inclined plane.

ANDREW J. BARTLETT. Witnesses: DOROTHY A. GoEREs, FRED. K. DAGGETT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

